The Generation of Vorticity in Cosmological N-body Simulations

Understand

Clustering of a perfect fluid does not lead to the generation of vorticity.

• It is the collisionless nature of dark matter, inducing velocity dispersion and shell crossing, which is at the origin of cosmological vorticity generation.
• In this paper we investigate the generation of vorticity during the formation of cosmological large scale structure using the public relativistic N-body code $\textit{gevolution}$.
• We test several methods to compute the vorticity power spectrum and we study its convergence with respect to the mass and grid resolution of our simulations.